Vulnerability Description
datamodel-code-generator generates Pydantic v2 models, dataclasses, TypedDict, and msgspec.Struct from OpenAPI, JSON Schema, GraphQL, Avro, Protobuf, and raw JSON, YAML, or CSV. Prior to 0.63.0, datamodel-code-generator validates a URL host once in src/datamodel_code_generator/http.py through get_body, _validate_url_for_fetch, and _get_ips_from_host, but then lets httpx resolve the host again for the connection, allowing DNS rebinding to bypass allow_private_network=False and reach internal services. This issue is fixed in version 0.63.0.
CVSS Score
HIGH
Affected Products
| Vendor | Product | Versions |
|---|---|---|
| Koxudaxi | Datamodel-Code-Generator | < 0.63.0 |
Related Weaknesses (CWE)
References
- https://github.com/koxudaxi/datamodel-code-generator/commit/25c8b7e497419eb20b23Patch
- https://github.com/koxudaxi/datamodel-code-generator/releases/tag/0.63.0Release Notes
- https://github.com/koxudaxi/datamodel-code-generator/security/advisories/GHSA-vxExploitVendor Advisory
- https://gist.github.com/thegr1ffyn/c1d54dd6ff2a4c0d7d0dabe00c4985f4Third Party Advisory
FAQ
What is CVE-2026-55391?
CVE-2026-55391 is a vulnerability with a CVSS score of 7.5 (HIGH). datamodel-code-generator generates Pydantic v2 models, dataclasses, TypedDict, and msgspec.Struct from OpenAPI, JSON Schema, GraphQL, Avro, Protobuf, and raw JSON, YAML, or CSV. Prior to 0.63.0, datam...
How severe is CVE-2026-55391?
CVE-2026-55391 has been rated HIGH with a CVSS base score of 7.5/10. Review the CVSS metrics above for detailed severity breakdown.
Is there a patch for CVE-2026-55391?
Check the references section above for vendor advisories and patch information. Affected products include: Koxudaxi Datamodel-Code-Generator.